May the Force be with you
Units for force?
Newtons, lbs.
The resistance of an object to a change in its motion is...
Inertia
The amount of gravitational attraction one object has for another object varies with the object's...
Mass
Explain the difference between mass & weight.
Amount of matter vs. force due to gravity, units differ
The wheel component of a pulley is called a...
Sheave
Does the force of friction aid or oppose the motion of an object?
Oppose
For every action, the reaction is...
Equal & opposite
Balanced forces are...
Equal & opposite
True or false? Weight can be measured in Newtons.
True
True or false? A wheelbarrow is a 1st class lever.
False
True or false? The force of gravity between 2 objects increases as the distance between 2 objects decreases.
True
In a second-class lever, the resistance is where?
Between the effort & fulcrum
Force equals...
Mass x Acceleration, or work/distance
The amount of work done when a force of 300 N moves an object a distance of 2 m is?
600 N-m
True or false? A Newton-meter is a unit for work.
True (force x distance)
The weight of an object varies with?
The pull of gravity.
A lever that rotates in a circle is called a... (think Bill Nye video)
Wheel & axle
A chain, belt, or rope wrapped around a wheel is called a...
Pulley
The amount of sliding friction depends on 2 things; what are they?
Weight/mass of the moving object, & the type of surface that the object slides across
Where is the effort in a 3rd class lever?
Between the resistance & the fulcrum
Describe when forces were balanced, & when forces were unbalanced with the watermelon/rubber band experiment.
Forces were balanced until the watermelon imploded!
True or false? Sand can be used to reduce friction.
False
One joule of work is the same as one...
Newton-meter
Define weight.
The response of mass to the pull of Gravity.
The law of conservation of momentum states...
That momentum cannot be lost or gained